remove observedGeneration from postgresDatabase

[DmytroPI-dev]

Description

This PR aligns PostgresDatabase with the watch-driven reconciliation approach used for PostgresCluster. It removes the reconcile skip based on ObservedGeneration, reacts to owned Secret/ConfigMap drift even when the spec is unchanged, repairs configmap drift declaratively, and degrades status instead of recreating previously provisioned managed secrets that were deleted.

Key Changes

• postgresdatabase_controller.go add explicit drift-trigger predicates for owned Secret, ConfigMap, and relevant CNPG Database changes. Conflict retries are requeued without surfacing noisy reconcile errors.
• database.go remove the ObservedGeneration short-circuit and revalidated stages on every reconcile. Add drift handling for managed user secrets, configmap repair/re-adoption, retained-resource adoption, conflict-friendly database reconcile handling, and quieter ready/not-found paths.
• events.go Add events for drift and retained-resource adoption.
• cluster.go reduced log noise on transient status-update conflicts.

Testing and Verification

• Update controller tests in postgresdatabase_controller_test.go for:
  • configmap drift repair
  • deleted configmap recreation
  • deleted managed secret degradation without recreation
  • secret ownership re-adoption
  • adding a new database to an already provisioned resource
  • secondary-resource watch predicates
  • cluster-missing and role-conflict regressions
• Add unit tests in database_unit_test.go for secret/configmap drift and adoption paths.
• Verified behavior from controller logs/events during delete/recreate flows with both Delete and Retain policies.
• Automated tests were updated. All tests passed

Related Issues

CPI-1950

PR Checklist

• Code changes adhere to the project's coding standards.
• Relevant unit and integration tests are included.
• Documentation has been updated accordingly.
• All tests pass locally.
• The PR description follows the project's guidelines.

[mploski]

whats the difference between this predicate and GenerationChangedPredicate?

[DmytroPI-dev]

If my understanding is correct, GenerationChangedPredicate is triggered only when CNPG Database spec changes. If we have status-only update, generation might not always change. Owner reference changes on the owned CNPG Database would also stop triggering reconciliation.

[mploski]

but then if you expect object to be triggered with every change including status, cant we simply remove predicate and react to every trigger? What events we filter out right now?

[DmytroPI-dev]

As we update status at least in three places, (414, 97, 627), and this custom predicate triggers reconcile in cases when deletion starts, finalizers changes, and ignore other update-only metadata/status changes. We filter out condition-only updates, like ClusterReady, SecretsReady, ConfigMapsReady, RolesReady, etc. This was one of the sources of reconciliation storm we were struggling.

[M4KIF]

apart from the logging and some other nits (which ofc should be addressed) there is a nice structure seen -> reconcile flow rework -> tests expanded accordingly to catch the change and validate It. I like that